I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
stirp stirrup strap strep strip strop satrap stripe stripy satrapy strappy stroppy
stirp tarp trap trip trop atrip rattrap satrap strap strep strip strop
stir store astray sutra strow stria strew stray strawy straw story storey stereo satire stere starry stare star stair striae stroy astir estray